""ET TROJAN LegionLoader Activity Observed (LegionClient)""

SID: 2046298

Revision: 1

Class Type: trojan-activity

Metadata: affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_06_16, deployment Perimeter, deployment SSLDecrypt, malware_family LegionLoader, performance_impact Low, confidence High, signature_severity Major, updated_at 2023_06_22

Reference:

Protocol: tcp

Source Network: $HOME_NET

Source Port: any

Destination Network: $EXTERNAL_NET

Destination Port: $HTTP_PORTS

Flow: established,to_server

Contents:

  • Value: "POST"

  • Value: "/api-v1"

  • Value: "User-Agent|3a 20|LegionClient"

  • Value: !"Referer|3a 20|"

  • Value: "pauthx|3a 20|"

Within:

PCRE:

Special Options:

  • http_method

  • http_uri

  • http_header

  • fast_pattern

  • http_header

  • http_header

source